Thread: allegro spaceshooter prm!

while(!key[KEY_ESC])
//If the user hits escape, quit the program
{

if(key[KEY_RIGHT])
// If the user hits the right key, change the picture's X coordinate
{
my_pic_x ++;
// Moving right so up the X coordinate by 1
}
if(key[KEY_LEFT])
{
my_pic_x --;
}
if(key[KEY_UP]) //here is the problem
{


for( int w=0;w<50;w--)
{



putpixel(buffer,my_pic_x+10,my_pic_y+10,0);
putpixel(buffer,my_pic_x+10,my_pic_y--,50);

showBuffer ();


} }

if(key[KEY_DOWN])// Ditto' - only for down
{
my_pic_y ++;// Moving down, so
}
/*

my problem is this, when the user hits key UP there is suposed
to be a blue beam coming from the "ship"
that also happens BUT just once and then the program hookes up
*/

thanks justin u've been very helpful
but it wont work either
i think u are right about the code but i think the problem is
the key function because it seems like it only reeds the key hit once
i think allegro has a nother function that can prevents this

here is tge code


*************************************

#include <allegro.h>



int main(int argc, char *argv[])
{



allegro_init();
install_keyboard();



set_color_depth(16);

set_gfx_mode(GFX_AUTODETECT, 640,480,0,0);


BITMAP *my_pic;
my_pic = load_bitmap("c:\\g\\skepp.bmp", NULL);

BITMAP *buffer;


buffer = create_bitmap(640,480);
void showBuffer ();
{

blit (buffer, screen, 0, 0, 0, 0, 640, 480);
}


while(!key[KEY_ESC])
{

if(key[KEY_RIGHT])
{
my_pic_x ++;
}
else if(key[KEY_LEFT])
{
my_pic_x --;
}
else if(key[KEY_UP])
{
for(int w=500;w>0;w)
{

putpixel(buffer,100,w+10,0);
putpixel(buffer,100,w--,500);
void showBuffer ();

}



}
else if(key[KEY_DOWN])
{
my_pic_y ++;
}


acquire_screen();// Get the screen
draw_sprite(buffer, my_pic, my_pic_x, my_pic_y);//Draw the picture to the buffer
blit(buffer, screen, 0,0,0,0,640,480);//Draw the buffer to the screen
release_screen();// Release it



}


destroy_bitmap(my_pic);//Release the bitmap data
destroy_bitmap(buffer);//Release the bitmap data


return(0);// Exit with no errors
}
END_OF_MAIN();

- i must have posted the wrong code
i have written several codes for this sorry
****************************************
Once that is taken care of, you'll see a blue bullet go flying. However, it isn't lined up quite right... but that can be a later topic if you need help with it.

- i know but it will shoot once then it stops

sorry justin that i didn't ask this earlier but how do yo mean

////
Instead of having everything else pause while it travels across the screen, try incorporating the bullet loop with the full game loop so that the action continues (perhaps with the ability to shoot several bullets in a row, eventually).
////

Unless I'm just not following what your doing why do you have the buffer shown on every pass of the for loop instead of just once you are done drawing the shot. If you want the player to see the shot forming then you should do the fifty steps once per main loop and just do the drawing at the end of it.